Lindelof's Theorem
The Surface of Revolution generated by the external Catenary between a fixed point 
and its conjugate on theEnvelope of the Catenary through the fixed point is equal in Area to the surface of revolution generated byits two Lindelof Tangents, which cross the axis of rotation at the point and are calculable fromthe position of the points and Catenary.
- Conic Equidistant Projection
- Conic Projection
- Conic Section
- Conic Section Tangent
- Conjecture
- Conjugacy Class
- Conjugate Element
- Conjugate Gradient Method
- Conjugate Points
- Conjugate Subgroup
- Conjugation
- Conjunction
- Connected Graph
- Connected Set
- Connected Space
- Connected Sum
- Connected Sum Decomposition
- Connection
- Connection Coefficient
- Connectivity
- Connes Function
- Conocuneus of Wallis
- Conoid
- Consecutive Number Sequences
- Conservation of Number Principle